[Perception of health and health-related behavior of family caregivers of people with dementia]. / Gesundheitsvorstellungen und Gesundheitshandeln pflegender Angehöriger von Menschen mit Demenz.

BACKGROUND: Family caregivers of people with dementia are a group of highly burdened persons. As the duration of care increases this often results in a deterioration of the health of caregivers. In order to discover how measures of stress relief and health promotion of family caregivers must be embellished, the subjective health perceptions of this target group and the resulting health-related behavior should be considered. This article closes a gap in knowledge on this topic. OBJECTIVE: The main questions of this article are: what do family caregivers of people with dementia do in their everyday life to preserve their health and which subjective perceptions of health do they have? MATERIAL AND METHODS: To answer these questions a mixed methods research design was used, whereby 23 semi-structured guided interviews were conducted with family caregivers who support a person with dementia at home and analyzed using content analysis. RESULTS: The majority of family caregivers have diverse concepts of health and health behavior with individual focuses mainly concerning physical, psychological and social aspects. The interviewees mentioned a variety of factors influencing their health and discussed in particular the informal care situation and the related care responsibility. A correlation between individual health perceptions and the subjective health behavior was confirmed by the results of this investigation. CONCLUSION: Against this backdrop it can be concluded that the subjective perceptions of health for family caregivers of people with dementia need to be taken into account because of the influence on the subjective health behavior of this target group. In doing so, new impulses in the design of target-specific health promotion offers can be developed.

[Mobile dementia counseling as low-threshold assistance for caregiving relatives]. / Mobile Demenzberatung als niedrigschwelliges Hilfeangebot für pflegende Angehörige.

BACKGROUND: Comprehensive and easily accessible information and counseling for people with dementia and their caregivers can improve home care in many ways; however, for various reasons the affected persons rarely seek help and advice. When advice is sought the caregiving situation at home is mostly already in a crisis. The Rhine-Erft district, a rural area in Germany, improved its network of dementia care services by establishing a mobile gerontopsychiatric counseling service with a special focus on dementia. A multiprofessional and interdisciplinary team consisting of professional and voluntary personnel in a specially equipped bus offers free counseling at several public places in the district at least once a month. OBJECTIVES: The project was accompanied and scientifically evaluated by the authors of this article from 2012 to 2015. The German Ministry of Health funded the evaluation. The main objective of the scientific evaluation was to examine how to implement the mobile counseling in order to improve the situation for people with dementia and their informal caregivers. MATERIAL AND METHODS: A mixture of quantitative (e.g. standardized questionnaires) and qualitative (e.g. semi-structured interviews) methods was employed. RESULTS/CONCLUSION: The data show that the mobile counseling service fulfills an important role in the navigation into the healthcare system and contributes to the easing of caregiver burden. In particular, the low threshold of the service proved to be very effective. The mobile counseling service can reach those caregivers who would have sought professional advice too late or not at all.

Quasiballistic transport of Dirac fermions in a Bi2Se3 nanowire.

Quantum coherent transport of surface states in a mesoscopic nanowire of the three-dimensional topological insulator Bi(2}Se(3) is studied in the weak-disorder limit. At very low temperatures, many harmonics are evidenced in the Fourier transform of Aharonov-Bohm oscillations, revealing the long phase coherence length of spin-chiral Dirac fermions. Remarkably, from their exponential temperature dependence, we infer an unusual 1/T power law for the phase coherence length L(φ)(T). This decoherence is typical for quasiballistic fermions weakly coupled to their environment.

Delivery of carboplatin by carbon-based nanocontainers mediates increased cancer cell death.

Since the activity of several conventional anticancer drugs is restricted by resistance mechanisms and dose-limiting side-effects, the design of nanocarriers seems to be an efficient and promising approach for drug delivery. Their chemical and mechanical stability and their possible multifunctionality render tubular nanomaterials, such as carbon nanotubes (CNTs) and carbon nanofibres (CNFs), promising delivery agents for anticancer drugs. The goal of the present study was to investigate CNTs and CNFs in order to deliver carboplatin in vitro. No significant intrinsic toxicity of unloaded materials was found, confirming their biocompatibility. Carboplatin was loaded onto CNTs and CNFs, revealing a loading yield of 0.20 mg (CNT-CP) and 0.13 mg (CNF-CP) platinum per milligram of material. The platinum release depended on the carrier material. Whereas CNF-CP marginally released the drug, CNT-CP functioned as a drug depot, constantly releasing up to 68% within 14 days. The cytotoxicity of CNT-CP and CNF-CP in urological tumour cell lines was dependent on the drug release. CNT-CP was identified to be more effective than CNF-CP concerning the impairment of proliferation and clonogenic survival of tumour cells. Moreover, carboplatin, which was delivered by CNT-CP, exhibited a higher anticancer activity than free carboplatin.

Preparation of CNT-copper matrix composite films.

Copper matrix composite thin films reinforced with multiwall carbon nanotubes (CNT-Cu-MC) have been processed by electroplating on conducting or insulating underlayers on oxidized (100)Si substrates using iron catalyst particles. The nanotubes were grown by thermal or plasma enhanced catalytic CVD process. Enhanced interfacial strength to copper was achieved after covering the CNTs by plasma enhanced atomic layer deposition (PEALD) of a thin Ta-N or Ta-N/Zr-O interlayer. For copper plating a conventional copper electrolyte with additives (Ethone) was applied. The density of CNTs and their growth determine primarily the quality of the composite films. A sufficient dispersion of CNTs in the copper matrix and homogeneous copper plating were obtained for low density of CNTs. The CNT reinforcement changes the microstructure and electrical properties of electroplated copper films. The resistivity of the Cu films increases by multiwall CNT reinforcement as a result of changed microstructure.

Weakly-coupled quasi-1D helical modes in disordered 3D topological insulator quantum wires.

Disorder remains a key limitation in the search for robust signatures of topological superconductivity in condensed matter. Whereas clean semiconducting quantum wires gave promising results discussed in terms of Majorana bound states, disorder makes the interpretation more complex. Quantum wires of 3D topological insulators offer a serious alternative due to their perfectly-transmitted mode. An important aspect to consider is the mixing of quasi-1D surface modes due to the strong degree of disorder typical for such materials. Here, we reveal that the energy broadening γ of such modes is much smaller than their energy spacing Δ, an unusual result for highly-disordered mesoscopic nanostructures. This is evidenced by non-universal conductance fluctuations in highly-doped and disordered Bi2Se3 and Bi2Te3 nanowires. Theory shows that such a unique behavior is specific to spin-helical Dirac fermions with strong quantum confinement, which retain ballistic properties over an unusually large energy scale due to their spin texture. Our result confirms their potential to investigate topological superconductivity without ambiguity despite strong disorder.

Neural circuitry of abdominal pain-related fear learning and reinstatement in irritable bowel syndrome.

BACKGROUND: Altered pain anticipation likely contributes to disturbed central pain processing in chronic pain conditions like irritable bowel syndrome (IBS), but the learning processes shaping the expectation of pain remain poorly understood. We assessed the neural circuitry mediating the formation, extinction, and reactivation of abdominal pain-related memories in IBS patients compared to healthy controls (HC) in a differential fear conditioning paradigm. METHODS: During fear acquisition, predictive visual cues (CS(+)) were paired with rectal distensions (US), while control cues (CS(-)) were presented unpaired. During extinction, only CSs were presented. Subsequently, memory reactivation was assessed with a reinstatement procedure involving unexpected USs. Using functional magnetic resonance imaging, group differences in neural activation to CS(+) vs CS(-) were analyzed, along with skin conductance responses (SCR), CS valence, CS-US contingency, state anxiety, salivary cortisol, and alpha-amylase activity. The contribution of anxiety symptoms was addressed in covariance analyses. KEY RESULTS: Fear acquisition was altered in IBS, as indicated by more accurate contingency awareness, greater CS-related valence change, and enhanced CS(+)-induced differential activation of prefrontal cortex and amygdala. IBS patients further revealed enhanced differential cingulate activation during extinction and greater differential hippocampal activation during reinstatement. Anxiety affected neural responses during memory formation and reinstatement. CONCLUSIONS & INFERENCES: Abdominal pain-related fear learning and memory processes are altered in IBS, mediated by amygdala, cingulate cortex, prefrontal areas, and hippocampus. Enhanced reinstatement may contribute to hypervigilance and central pain amplification, especially in anxious patients. Preventing a 'relapse' of learned fear utilizing extinction-based interventions may be a promising treatment goal in IBS.

Determination of aliphatic and alicyclic amines in water by gas and liquid chromatography after derivatization by chloroformates.

Two new methods were developed for the analysis of aliphatic (n-propylamine, pentylamine, hexylamine, heptylamine, octylamine) and alicyclic (pyrrolidine, morpholine, piperidine, piperazine) amines in water samples after derivatization and liquid-liquid-extraction. The carbamate-derivatives formed were determined by GC/MS (trichloroethyl carbamates) as well as by HPLC/fluorescence detection (9-fluorenylmethyl carbamates) in a concentration range between 0.05 and 1.0 microg/l suitable for drinking water analysis. Applications to German rivers and sewage plants show that both new methods produce corresponding results in analysing aliphatic and alicyclic amines in surface waters as well as in waste water samples.